search for: createelimavailexternpass

On Thu, Jun 4, 2015 at 3:58 PM, Duncan P. N. Exon Smith < dexonsmith at apple.com> wrote: > > > Personally, I think the right approach is to add a bool to > createGlobalDCEPass defaulting to true named something like > IsAfterInlining. In most standard pass pipelines, GlobalDCE runs after > inlining for obvious reasons, so the default makes sense. The special case > is

...============= --- include/llvm/Transforms/IPO.h (revision 237590) +++ include/llvm/Transforms/IPO.h (working copy) @@ -71,6 +71,12 @@ ModulePass *createGlobalOptimizerPass(); ModulePass *createGlobalDCEPass(); //===----------------------------------------------------------------------===// +/// createElimAvailExternPass - This transform is designed to eliminate +/// available external globals (functions or global variables) +/// +ModulePass *createElimAvailExternPass(); + +//===----------------------------------------------------------------------===// /// createGVExtractionPass - If deleteFn is true, this pass d...

On Thu, Jun 4, 2015 at 5:33 PM, Reid Kleckner <rnk at google.com> wrote: > On Thu, Jun 4, 2015 at 5:17 PM, Teresa Johnson <tejohnson at google.com> wrote: >> >> Agreed. Although I assume you mean invoke the new pass under a >> ThinLTO-only option so that avail extern are not dropped in the >> compile pass before the LTO link? > > > No, this pass

...// here is a compile-time savings. > > More than the compile time savings, it actually increases the power of > GlobalDCE and can reduce object file size, so I'd mention that instead. Ok, right in your case that is the benefit. Will update the comment. > > + MPM.add(createElimAvailExternPass()); > + } > > + // Drop initializers of available externally global variables. > + for (Module::global_iterator I = M.global_begin(), E = M.global_end(); > + I != E; ++I) { > + if (!I->hasAvailableExternallyLinkage()) > + continue; > + if (I->ha...